I picked mine up from River Oaks with less than a 1/4 tank of Diesel and a half-tank of DEF.
The GM sent me an email about my buying experience (which was good), but I told him this is the first time in my life I had ever picked up a dealer prepped vehicle new or used that didn't have full tank of fuel in it.... He promptly replied asking me to come in for w fill up. I may take a rain check on the DEF since it's HOT here in Houston.

River Oaks will treat you right. The only problem with that dealership is the congested traffic in the area.

Rather than ask for diesel, ask for an oil change if you don't plan to do it yourself. If you go that route, be sure to remind the service writer that the procedure on the EcoDiesel does not make it an express lube event. If you wait, it should take roughly an hour, then check the receipt and confirm that 8 qts were added.